Geometrical instrument



` 1 62211515L March 221927' J. LIBERTY n, f i "L,l -I I v GEOMETRICAL INSTRUMENT Filed Ausl. 5, 1926 lo r gwventoz Joseph Patented Mar. 22, 1927.

.JOSEPH LBERTY, HARTFORD, CONNECTICUT.

i GEDMETRICAL .11N STRUMENT.

Application filed August 5, 1926..

This invention relates to improvements in geometrical instruments, having 'for an object. to provide a combined straight edge, measuring device andati-:instable angle, especially advantageous `for use in the ineasur ing of lun'ib-er or other material and laying out thereon marking indicative of the proper measurements and angles at which such niaterial is to be out.

it is also an equally important object of the invent-ion to provide a dev-ice of the character mentioned having angle deter'- mining and straight edge means adjust-ably mounted on the opposite ends thereof, said.

means being' capable of fixed positioning with respect to the body vportion ofthe device when at the desired or proper angles.

It is also an object of the invention to provide an adjustable body portion for the tool having linear measurement indicating markings on one portion of the same cooperable withY an indicator means on the adjacent portion, whereby a desired length or overall measurement may be obtained.

Other objects ofthe invention ywill bein part obvious and in part pointed out hereinafter.

in order that the invention and its mode of yoperation may be readily lunderstood by persons skilled in the art, I have 'in the :accompanying illustrative drawings and inthe following detailed description based thereupon, set out one possible embodiment of the invention.

in ,these drawings:

`Figure 1 is an elevation of the improved tool whenv in a partiallyextended position,

Figure 2 is a similar view with the adjust able body portion of the tool in its contracted position, and

Figure 3 is an enlarged fragmentary detail longitudinal section taken on the line 3 3 of the Figure 1.

Having more particular reference to the drawings, in connection with which like characters of reference will designate corresponding parts throughout, the improved tool may be stated to comprise a body por* tion composed of longitudinally dispos-ed and relatively parallel sections 1 and 2, one face or side of the section 2 having linear measurement indicating markings 3 inscribed thereupon whereby to permit of usage of the device for measuring distances, while to effect slidable interconnection as between the sections 1 and 2, loops of substan- Serial No. 127,199.

disalignment or relative llateral movement as between such sections vwill be positively prevented. Also, it is to be noted at this time, that the outer edge of the loop 5 is .formed with a straight edge portion 6 which, in turn, is cooperablewith au adjacent marking 3 upon the 'corresponding or adjacent face lof the body section k2, whereby a user of the tool may accurately secure or ascertain a prescribed length or distance "by comparing and then registering a particu-lar marking 3 with the straightedge 6. of said loop 5.

That the longitudinally adjustable sections 1 and 2 may be releasably secured in adjusted positions, shoes or bearing pieces??l and 8 are provided, theshoe 7 being embracingly engaged with one yportion of the linner face of the Iloop 5 and having slidable contact with the adjacent `face of the section 2 Whereas the shoe 8 is loosely and embracingly vengaged with the inner face of one side of the loop 4 `and is adapted to have an adjusting and rsecuring finger screw 9 turn-ed into `engagement therewith by Way of a suitably y screw threaded opening Vformed in the outer side of said loop t, in the manner shown in the Figure 3. Thus, by turning the wing screw 9 inwardly, the inner lend of the shank thereof will have engagement with an adjacent portion of the bearing shoe .8 and by consequence, said bearing shoe 8 will be passingly or bindingly engaged with the adjacent portion of the section 1, hence, releasably securing said sections 1 and 2 in their rela-tively adjusted relation.

The bearing shoes 7 and 8 are preferably formed of a metal softer than the metal from which the combination tool is constructed, obviously, to avoid the scratching of the adjacent contacting faces of the body portion sections 1 and 2 and also, to ensure of free sliding movement therebetween as well as the fixed positioning of said sections in relatively adjusted positions, as when the Wing screw 9 is turned so as to effect binding of the bearing shoe 8 upon the adjacent portion of the section 1.

Straight edges 10 and 11 are provided at the opposite or outer ends of the sectional body portion, being pivoted to the adjacent ends of said sections 1 and 2 as indicated by the numeral 12 and having linear measurement markings generally designated by the Y numeral 13 inscribed or otherwise presented upon certain or both of their opposite faces. To secure these straight edges 10 and 11 in relatively angular adjusted positions with respect to their particular sections 1 and 2 of the body portion, semi-circular or segmental bars 14 are formed integral with the inner portions of each of straight edges 10 and 11, and as will be noted upon reference to the Figures 1 and 2, segmental slots or ways 15 are formed in portions of said bar 14 and'serve to receive adjusting screws 16 therethrough, the shank portions of said screws also passing through openings formed in adjacent portions of the sections 1 and 2 whereupon wing nuts or similar locking devices 17 are turned into engagement therewith. In this way, it will be understood that the pivotally mounted straight edges 10 and 11 can be Xedly secured in different angular adjustments with respect to their particular sections 1 and 2, merely by loosening the wing nuts 17, then pivoting the straight edges 10 and 11 to the desired angular positions whereupon said wing nuts are re-tight ened to effect a, clamping connection as between the adjacent segmental bar 14; and its particular section 1 or 2.

Preferably, degree indicative markings generally indicated by the numeral 1S are inscribed or otherwise presented upon certain or both of the faces of the segmental bars 14, and, as will be appreciated, these markings are cooperable with the adjacent sections 1 or 2, whereby the angular adjustment of the several straight edges 10 and 11 with respect to their particular sections 1` and 2 to the desired angular degree `may be tool.

Manifestly, the construction shown is capable of considerable modification and such modification as is within the scope of my claim, I consider within thespirit of my invention.

I claim:

A tool of the character described compris ing a body portion composed of longitudinally aligned and relatively parallel sections, one of said sections having markings on a. face thereof, rectangularly shaped loops formed integralwith the inner ends of each of said sections and snugly and slidably elnbracing the adjacent portion of the relatively opposite sections, bearing shoes engaged with certain of the portions of each of said loops and having sliding Contact with the adjacent faces ofthe opposite sections of said body portion, said bearing `shoes being formed of al material softer than that from which said body portion sections are formed, a finger screw turned into engagement with one of said loops and adapted to have engagement with an adjacent portion of the bearing shoe carried thereby whereby to clampingly engage the same with an adjacent portion of the opposite body portion section slidably received there# through, straight edges pivotally mounted upon the opposite ends of said sections, segmental bars having correspondingly formed slots therein, integral with the inner sides of `said stra-ight edges and arranged adjacent portions of the outer extremities of said body portion sections, and locking means passing through said outer portions of the body portion sections and through the slots in said segmental bars whereby to'releasably secure said bars and their respective straight edges in angularly adjusted positions with respect to the body portion.

hand.

JOSEPH LIBERTY.

In witness whereof I have hereunto set my 

